NEW DELHI: He could be building his strength for future political debates or he could just be more comfortable silently watching proceedings from the middle benches -- take your pick.But after a spectacular political debut, Congress president Sonia Gandhi's son Rahul has been one of the quietest and most low profile MPs in parliament. He has only been seen -- not so regularly either -- but not heard since he read out his oath or allegiance while formally signing up as a member of the Lok Sabha, the lower house of parliament.A good likeness of his father, the slain former premier Rajiv Gandhi, Rahul enters the house quietly in his white kurta-pyjama and sports shoes, but a low buzz in the press and viewers' gallery almost always signals his arrival.Like any average MP, he scouts around for space to sit, declining offers of a seat by members much older than him, and quickly slides into the one most easily available.Sometimes, he strikes up a conversation with the person next to